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><A
NAME="EXTERNAL-INTERFACES"
>G.1. Client Interfaces</A
></H1
><P
>   There are only two client interfaces included in the base
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> distribution:
   <P
></P
></P><UL
><LI
><P
>      <A
HREF="libpq.html"
>libpq</A
> is included because it is the
      primary C language interface, and because many other client interfaces
      are built on top of it.
     </P
></LI
><LI
><P
>      <A
HREF="ecpg.html"
>ECPG</A
> is included because it depends on the
      server-side SQL grammar, and is therefore sensitive to changes in
      <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> itself.
     </P
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><P>

   All other language interfaces are external projects and are distributed
   separately. <A
HREF="external-interfaces.html#LANGUAGE-INTERFACE-TABLE"
>Table G-1</A
> includes a list of
   some of these projects. Note that some of these packages might not be
   released under the same license as <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>. For more
   information on each language interface, including licensing terms, refer to
   its website and documentation.
  </P
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><P
><B
>Table G-1. Externally Maintained Client Interfaces</B
></P
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><TR
><TH
>Name</TH
><TH
>Language</TH
><TH
>Comments</TH
><TH
>Website</TH
></TR
></THEAD
><TBODY
><TR
><TD
>DBD::Pg</TD
><TD
>Perl</TD
><TD
>Perl DBI driver</TD
><TD
><A
HREF="http://search.cpan.org/dist/DBD-Pg/"
TARGET="_top"
>http://search.cpan.org/dist/DBD-Pg/</A
></TD
></TR
><TR
><TD
>JDBC</TD
><TD
>JDBC</TD
><TD
>Type 4 JDBC driver</TD
><TD
><A
HREF="http://jdbc.postgresql.org/"
TARGET="_top"
>http://jdbc.postgresql.org/</A
></TD
></TR
><TR
><TD
>libpqxx</TD
><TD
>C++</TD
><TD
>New-style C++ interface</TD
><TD
><A
HREF="http://pqxx.org/"
TARGET="_top"
>http://pqxx.org/</A
></TD
></TR
><TR
><TD
>Npgsql</TD
><TD
>.NET</TD
><TD
>.NET data provider</TD
><TD
><A
HREF="http://npgsql.projects.postgresql.org/"
TARGET="_top"
>http://npgsql.projects.postgresql.org/</A
></TD
></TR
><TR
><TD
>ODBCng</TD
><TD
>ODBC</TD
><TD
>An alternative ODBC driver</TD
><TD
><A
HREF="http://projects.commandprompt.com/public/odbcng/"
TARGET="_top"
>http://projects.commandprompt.com/public/odbcng/</A
></TD
></TR
><TR
><TD
>pgtclng</TD
><TD
>Tcl</TD
><TD
>&nbsp;</TD
><TD
><A
HREF="http://pgfoundry.org/projects/pgtclng/"
TARGET="_top"
>http://pgfoundry.org/projects/pgtclng/</A
></TD
></TR
><TR
><TD
>psqlODBC</TD
><TD
>ODBC</TD
><TD
>The most commonly-used ODBC driver</TD
><TD
><A
HREF="http://psqlodbc.projects.postgresql.org/"
TARGET="_top"
>http://psqlodbc.projects.postgresql.org/</A
></TD
></TR
><TR
><TD
>psycopg</TD
><TD
>Python</TD
><TD
>DB API 2.0-compliant</TD
><TD
><A
HREF="http://www.initd.org/"
TARGET="_top"
>http://www.initd.org/</A
></TD
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